Geotiff not rendering correctly

I have successfully rendered most standard Geotiffs using Sharpmap, but a particular set of images provided to me do not render correctly. The georeferencing works fine - it is purely an issue with the rendering - what should be a typical satellite image
appears a bit like a patch of cloudy/blue sky - white and pale blue/green patches. I would attach example images if it were possible, please advise how I could upload?

The relevant snippet from GdalInfo for the problematic files is as follows:

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You can upload an image on the issue page. You might need to crop it so it fits the size of < 4MB.